Thermal Motor Protection; Table 4-1 Cooling Water Specification - Siemens SIMOTICS TN N-compact 1LH8 Operating Instructions & Installation Instructions

Preparations for use

4.5 Thermal motor protection

Table 4-1
Water analysis
pH
Conductivity
Chloride (Cl
Manganese (Mn
Fluoride (F)
Sulfate (SO
Copper (CU
Silicic acid
Free carbon dioxide
Total salts
Nitrate level
Suspended matter
Permanganate consumption
Total hardness on German water hardness scale
Carbonate hardness on German water hardness
scale
Ammonium content
Iron content
Note
Order-specific agreements
Observe any order-specific agreements regarding the cooling water specification. These might
deviate from the named cooling-water specification.
Note
Maintenance
The cooling system is maintenance-free provided cooling water of the specified quality is used.
4.5 Thermal motor protection
The machine is equipped with PTC thermistors for direct monitoring of the motor temperature
to protect the machine against overheating during operation. Plan a corresponding circuit for
monitoring.
See also
Set values for monitoring the winding temperature (Page 77)
Setpoint values for monitoring the bearing temperature (Page 77)
26
Cooling water specification
)
-
2-)
)
2-
4
)
2+
Measured values
> 7.5 - 10
< 600 µS/cm
< 150 mg/l
< 0.05 mg/l
< 0.05 mg/l
< 150 mg/l
< 0.1 mg/l
< 25 mg/l
Without
< 1000 mg/l
< 20 mg/l
< 10 mg/l
< 12 mg/l
< 12
< 12
< 10 mg/l
< 0.2 mg/l
SIMOTICS TN Series N-compact 1LH8
Operating Instructions 06/2017